A lensed fiber Bragg grating-based membrane-in-the-middle optomechanical cavity

Area of Science:

• Optomechanics
• Nanotechnology
• Optical Engineering

Background:

• Optomechanical systems leverage the interaction between optical fields and mechanical vibrations.
• Fiber-based devices offer a practical platform for exploiting these interactions.
• High-quality factor optical cavities are crucial for sensitive optomechanical measurements.

Purpose of the Study:

• To present an alternative fiber-based optomechanical system.
• To characterize the optical and optomechanical properties of a stabilized system.
• To demonstrate the long-term stability of the optomechanical sensor.

Main Methods:

• Fabrication of a Fabry-Perot cavity using a fiber core grating and a dielectric mirror.
• Implementation of the Pound-Drever-Hall technique for laser frequency stabilization.
• Characterization of optical and optomechanical properties using various membrane geometries.
• Measurement of thermomechanical noise spectrum over extended periods.

Main Results:

• A high-quality factor Fabry-Perot cavity with a silicon nitride membrane was successfully realized.
• Laser frequency stabilization reduced low-frequency noise significantly.
• Optomechanical resonance frequencies were observed in the hundreds of kilohertz range.
• Excellent long-term stability was demonstrated through continuous thermomechanical noise measurements.

Conclusions:

• The developed fiber-based optomechanical system exhibits remarkable stability.
• The system is a promising candidate for advanced optomechanical sensing applications.
• The methodology provides a robust approach for characterizing such devices.